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From Namibia

 
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Harald



Joined: 13 May 2011
Posts: 525
Location: Steinberg, Norway

PostPosted: Wed Aug 08, 2018 1:03 pm    Post subject: From Namibia Reply with quote

Hi there,
Here is a project I´ve been working on.
This is Boltwoodite from Namibia.
FOV about 6mm, 500 images with 15µm step. Mitu M Plan APO 5x on EOS 7D


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Harald

Lier Fotoklubb / NSFF
AFIAP / CPS
BGF / GMV
http://www.500px.com/blender11
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hero



Joined: 17 Jul 2017
Posts: 71
Location: California

PostPosted: Wed Aug 08, 2018 8:17 pm    Post subject: Reply with quote

What a coincidence--very recently, I acquired a sample of this species and did a few stacks ranging from 3x to 5x. But I don't have a Mitutoyo, just the MP-E.

Here's my photo, 121 images on full frame sensor. Stacked with Zerene.




And here is a 100% crop of the same image.



The clear crystals are calcite, I believe, but there are numerous acicular dark brown crystals interpenetrating the calcite whose identity is unknown to me. Locality is the Goanikontes claim, Erongo, Namibia--most likely the same as yours.

Have you tried viewing the specimen under UV illumination? The fluorescence is quite striking.
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Harald



Joined: 13 May 2011
Posts: 525
Location: Steinberg, Norway

PostPosted: Sat Aug 11, 2018 12:25 pm    Post subject: Reply with quote

Hi there hero,
Thanks for your comments and the images. The world is not that big as you know Wink
Not tried with UV light. Long or short wave?
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Harald

Lier Fotoklubb / NSFF
AFIAP / CPS
BGF / GMV
http://www.500px.com/blender11
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hero



Joined: 17 Jul 2017
Posts: 71
Location: California

PostPosted: Sat Aug 11, 2018 3:15 pm    Post subject: Reply with quote

Indeed! To know that there are others who have the same interests, who understand the challenges and rewards of macrophotography, is always refreshing.

I believe your specimen also shows inclusions in the clear crystals--it would be good to find out what they might be.

I used 365 nm UV illumination. Shorter is better, with less visible light contamination from the source. Here's what mine looked like under UV, but to me it doesn't quite capture the strength of the fluorescence. I suspect yours will fluoresce more brightly.



If you have more mineral specimens, I suggest you look at them all under UV illumination, because there were several species in my collection that I did not expect to fluoresce, but ended up doing so, usually because there is another species present (very commonly calcite, sometimes fluorite, chalcedony, hyalite opal, and occasionally some I cannot identify).
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Harald



Joined: 13 May 2011
Posts: 525
Location: Steinberg, Norway

PostPosted: Sun Aug 12, 2018 6:38 am    Post subject: Reply with quote

Just great hero.
I have a great interest in micro minerals.
In my local geo club, people are coming to me and ask if I can photograph for them. If I can get anything out of it. And I allways reply "Can you see it?". If the say yes, theres no problem.

Keep those micro coming Very Happy
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Kind Regards
Harald

Lier Fotoklubb / NSFF
AFIAP / CPS
BGF / GMV
http://www.500px.com/blender11
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